JP2001134925A - Glass for information recording medium board and glass board for information recording medium - Google Patents
Glass for information recording medium board and glass board for information recording mediumInfo
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- JP2001134925A JP2001134925A JP34361899A JP34361899A JP2001134925A JP 2001134925 A JP2001134925 A JP 2001134925A JP 34361899 A JP34361899 A JP 34361899A JP 34361899 A JP34361899 A JP 34361899A JP 2001134925 A JP2001134925 A JP 2001134925A
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- recording medium
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、磁気ディスク、光
ディスク、等の情報記録媒体の基板に用いられるガラス
に関する。The present invention relates to a glass used for a substrate of an information recording medium such as a magnetic disk and an optical disk.
【０００２】[0002]
【従来の技術】従来、情報記録媒体用基板、たとえば磁
気ディスク（ハードディスク）用基板の材料としては、
アルミニウム、ガラス、セラミックス、カーボンなどが
知られている。現在では、サイズや用途に応じて主にア
ルミニウムおよびガラスが実用化されている。なかでも
ガラス基板は、表面の平滑性や機械的強度が優れている
ため、その使用範囲が拡大している。2. Description of the Related Art Conventionally, as a material for a substrate for an information recording medium, for example, a substrate for a magnetic disk (hard disk),
Aluminum, glass, ceramics, carbon and the like are known. At present, aluminum and glass are mainly put to practical use depending on the size and application. Above all, the glass substrate is excellent in surface smoothness and mechanical strength, and its use range is expanding.
【０００３】このようなガラス基板として、質量百分率
表示の組成が、ＳｉＯ2：６５．３％、Ａｌ2Ｏ3：８．
６％、ＺｒＯ2：３．５％、Ｌｉ2Ｏ：１２．５％、Ｎａ
2Ｏ：１０．１％、であるガラス（以下「従来ガラス」
という。）からなるガラス基板が例示される。[0003] As such a glass substrate, the composition expressed by mass percentage is SiO 2 : 65.3%, Al 2 O 3 : 8.8.
6%, ZrO 2: 3.5% , Li 2 O: 12.5%, Na
2 O: 10.1%, glass (hereinafter referred to as "conventional glass", which is a
That. ) Is exemplified.
【０００４】[0004]
【発明が解決しようとする課題】近年ハードディスクド
ライブについては記憶容量の向上が求められており、高
記録密度化および高速回転化が進行している。ハードデ
ィスクの回転速度は現在７２００ｒｐｍ程度であるが、
今後１００００ｒｐｍ、さらには１４０００ｒｐｍに増
加すると予測されている。この高速回転化に伴いガラス
基板がたわみやすくなる。In recent years, there has been a demand for an improvement in the storage capacity of hard disk drives, and higher recording densities and higher rotation speeds have been progressing. The rotation speed of the hard disk is currently about 7200 rpm,
It is expected to increase to 10,000 rpm and further to 14,000 rpm in the future. The glass substrate is likely to bend with this high-speed rotation.
【０００５】またパソコンの小型化に伴いハードディス
クの小型化および薄型化が提言されている。現在、６５
ｍｍハードディスクのガラス基板の厚さは０．６３ｍｍ
程度であるが、将来的には０．４３ｍｍ、さらには０．
３８ｍｍへと薄くなることが予想されている。しかしガ
ラス基板が薄くなればなるほどたわみや反りが生じやす
くなる。[0005] With the miniaturization of personal computers, miniaturization and thinning of hard disks have been proposed. Currently 65
mm Hard disk glass substrate thickness is 0.63mm
However, in the future, it will be 0.43 mm, and even 0.3 mm.
It is expected to be as thin as 38 mm. However, the thinner the glass substrate, the more likely it is to bend or warp.
【０００６】一方、前記高記録密度化の進行に伴ない、
ハードディスクと読み取り磁気ヘッドとの間隔は狭くな
ってきており、上記のようなガラス基板のたわみや反り
はハードディスク破損の原因となる。従来使用されてい
るガラス基板を薄くしていくと上記のたわみや反りによ
る問題が顕在化するため、薄型化が困難である。On the other hand, with the progress of the high recording density,
The distance between the hard disk and the read magnetic head is becoming narrower, and the above-described deflection or warpage of the glass substrate causes damage to the hard disk. If the glass substrate used conventionally is made thinner, the above-mentioned problems due to the bending and warping become apparent, and it is difficult to make the glass substrate thinner.
【０００７】この問題を解決するため、特開平１１−１
１６２６７においては高いヤング率を有するガラス基板
が開示されている。このガラス基板のヤング率は１１０
ＧＰａ以上であり、薄型化した場合でもガラス基板のた
わみや反りの問題が生じにくい。しかしハードディスク
用ガラス基板には、高ヤング率に加え大量生産が容易で
あることが求められている。大量生産という観点から
は、溶融ガラスをガラス板に成形するに際しガラスが失
透しにくいことが求められている。To solve this problem, Japanese Patent Laid-Open No. 11-1
No. 16267 discloses a glass substrate having a high Young's modulus. The Young's modulus of this glass substrate is 110
GPa or more, and the problem of bending and warping of the glass substrate hardly occurs even when the glass substrate is thinned. However, glass substrates for hard disks are required to be easily mass-produced in addition to high Young's modulus. From the viewpoint of mass production, it is required that the glass is not easily devitrified when the molten glass is formed into a glass plate.
【０００８】さらに、ハードディスク用ガラス基板に
は、その在庫中に表面性状が著しく変化して前記ガラス
基板上に形成される下地膜、磁性膜、保護膜等がはがれ
ることがないこと、すなわち耐候性が求められる。Further, the glass substrate for a hard disk is free from the possibility that the underlayer film, the magnetic film, the protective film and the like formed on the glass substrate are peeled off due to the remarkable change in the surface properties during the stock, that is, the weather resistance. Is required.
【０００９】前記従来ガラスからなるガラス基板の耐候
性は高くないが、このガラス基板は化学強化等の処理に
よってその耐候性は高くなり許容されるレベルとなる。
これは、耐候性を低下させる主たる原因であるアルカリ
金属酸化物成分が化学強化等の処理によってガラス基板
表面から除去されるためと考えられる。しかし、たとえ
ば化学強化処理には、工程数増加以外に、化学強化処理
後のガラス基板表面に汚れが付着しやすい、等の問題が
あった。Although the weather resistance of the glass substrate made of the conventional glass is not high, the weather resistance of the glass substrate is increased by a process such as chemical strengthening, so that the glass substrate reaches an acceptable level.
This is presumably because the alkali metal oxide component, which is the main cause of lowering the weather resistance, is removed from the glass substrate surface by a treatment such as chemical strengthening. However, for example, in addition to the increase in the number of steps, the chemical strengthening treatment has a problem that dirt easily adheres to the glass substrate surface after the chemical strengthening treatment.
【００１０】また、ハードディスクと読み取り磁気ヘッ
ドとの間隔がより狭くなりつつあるのに伴ってハードデ
ィスクにはより高い表面平滑性が求められている。その
ため研磨しやすいハードディスク用ガラス基板が求めら
れている。本発明は、以上の課題を解決し、高いヤング
率を有し、かつ失透しにくい情報記録媒体基板用ガラ
ス、および耐候性の高い情報記録媒体用ガラス基板の提
供を目的とする。[0010] Further, as the distance between the hard disk and the read magnetic head is becoming narrower, higher surface smoothness is required for the hard disk. Therefore, there is a demand for a glass substrate for a hard disk which is easily polished. An object of the present invention is to solve the above-mentioned problems and to provide a glass for an information recording medium substrate having a high Young's modulus and which is not easily devitrified, and a glass substrate for an information recording medium having high weather resistance.
【００１１】[0011]
【課題を解決するための手段】本発明は、下記酸化物基
準のモル％表示で実質的に、 ＳｉＯ2 ３０％以上６０％以下、 Ａｌ2Ｏ3 １％以上２０％未満、 ＭｇＯ １％以上２０％未満、 ＣａＯ ２５％以下、 ＳｒＯ １５％以下、 ＺｎＯ ２０％以下、 ＴｉＯ2 １０％以下、 ＺｒＯ2 １０％以下、 Ｌｉ2Ｏ １５％以下、 Ｎａ2Ｏ ２％以下、 Ｙ2Ｏ3 ２５％以下、 Ｌａ2Ｏ3 ２５％以下、 からなり、Ａｌ2Ｏ3とＭｇＯの含有量の合計Ａｌ2Ｏ3＋
ＭｇＯが２８％未満、かつ、Ａｌ2Ｏ3、ＭｇＯおよびＣ
ａＯの含有量の合計Ａｌ2Ｏ3＋ＭｇＯ＋ＣａＯが４０％
未満である情報記録媒体基板用ガラスを提供する。ま
た、本発明は、前記情報記録媒体基板用ガラスからなる
情報記録媒体用ガラス基板を提供する。Means for Solving the Problems According to the present invention, in terms of the following mol% on an oxide basis, SiO 2 is 30% or more and 60% or less, Al 2 O 3 is 1% or more and less than 20%, and MgO is 1% or more. less than 20%, CaO 25% or less, SrO 15% or less, 20% ZnO less, TiO 2 10% or less, ZrO 2 10% or less, Li 2 O 15% or less, Na 2 O 2% or less, Y 2 O 3 25 % Or less, La 2 O 3 25% or less, and the total content of Al 2 O 3 and MgO is Al 2 O 3 +
MgO is less than 28%, and Al 2 O 3 , MgO and C
Total of aO content Al 2 O 3 + MgO + CaO is 40%
Provided is a glass for an information recording medium substrate that is less than. Further, the present invention provides a glass substrate for an information recording medium, comprising the glass for an information recording medium.
【００１２】[0012]
【発明の実施の形態】本発明の情報記録媒体基板用ガラ
ス（以下単に本発明のガラスという。）は、ハードディ
スク、光ディスク、等の情報記録媒体の基板に用いられ
る。本発明のガラスの液相温度は１３００℃以下である
ことが好ましい。１３００℃超ではガラス製造時に失透
するおそれがある。より好ましくは１２６０℃以下、さ
らに好ましくは１２３０℃以下、特に好ましくは１２１
０℃以下である。BEST MODE FOR CARRYING OUT THE INVENTION The glass for an information recording medium substrate of the present invention (hereinafter simply referred to as the glass of the present invention) is used for a substrate of an information recording medium such as a hard disk or an optical disk. The liquidus temperature of the glass of the present invention is preferably 1300 ° C. or less. If it exceeds 1300 ° C., there is a risk of devitrification during glass production. It is more preferably at most 1,260 ° C, further preferably at most 1,230 ° C, particularly preferably at most 121 ° C.
0 ° C. or less.
【００１３】本発明のガラスのヤング率は１００ＧＰａ
以上であることが好ましい。１００ＧＰａ未満では情報
記録媒体高速回転時に基板がたわんだり反ったりするお
それがある。より好ましくは１１０ＧＰａ以上、さらに
好ましくは１２０ＧＰａ以上である。一方、そのヤング
率は１５０ＧＰａ以下であることが好ましい。１５０Ｇ
Ｐａ超では研磨しにくくなるおそれがある。より好まし
くは１４０ＧＰａ以下、特に好ましくは１３０ＧＰａ以
下である。The glass of the present invention has a Young's modulus of 100 GPa.
It is preferable that it is above. If it is less than 100 GPa, the substrate may bend or warp during high-speed rotation of the information recording medium. It is more preferably at least 110 GPa, even more preferably at least 120 GPa. On the other hand, the Young's modulus is preferably 150 GPa or less. 150G
If it exceeds Pa, polishing may be difficult. It is more preferably 140 GPa or less, particularly preferably 130 GPa or less.
【００１４】比弾性率（＝ヤング率÷密度）もガラス基
板のたわみやすさまたは反りやすさの指標であるが、本
発明のガラスの比弾性率は３２ＧＰａ／ｇ／ｃｍ3以上
であることが好ましい。より好ましくは３３ＧＰａ／ｇ
／ｃｍ3以上である。一方、その比弾性率は３８ＧＰａ
／ｇ／ｃｍ3以下であることが好ましい。３８ＧＰａ／
ｇ／ｃｍ3超では研磨しにくくなるおそれがある。研磨
をよりしやすくするためには３６ＧＰａ／ｇ／ｃｍ3未
満とすることが好ましい。The specific elastic modulus (= Young's modulus ÷ density) is also an index of the easiness of bending or warping of the glass substrate, and the specific elastic modulus of the glass of the present invention may be 32 GPa / g / cm 3 or more. preferable. More preferably 33 GPa / g
/ Cm 3 or more. On the other hand, its specific elastic modulus is 38 GPa
/ G / cm 3 or less. 38 GPa /
If it exceeds g / cm 3 , polishing may be difficult. In order to make the polishing easier, it is preferable to set it to less than 36 GPa / g / cm 3 .
【００１５】本発明のガラスは、下記酸化物基準のモル
％表示で実質的に、 ＳｉＯ2 ３８％以上５７％以下、 Ａｌ2Ｏ3 ３％以上１５％以下、 ＭｇＯ ５％以上２０％未満、 ＣａＯ １５％以下、 ＳｒＯ ８％以下、 ＺｎＯ １５％以下、 ＴｉＯ2 ７％以下、 ＺｒＯ2 ５％以下、 Ｌｉ2Ｏ １％以上１０％以下、 Ｎａ2Ｏ ２％以下、 Ｙ2Ｏ3 １０％以下、 Ｌａ2Ｏ3 １０％以下、 からなり、Ａｌ2Ｏ3とＭｇＯの含有量の合計Ａｌ2Ｏ3＋
ＭｇＯが２８％未満、かつ、Ａｌ2Ｏ3、ＭｇＯおよびＣ
ａＯの含有量の合計Ａｌ2Ｏ3＋ＭｇＯ＋ＣａＯが４０％
未満であることが好ましい。[0015] The glass of the present invention is substantially in mole% based on the following oxides, SiO 2 38% to 57% or less, Al 2 O 3 3% to 15% or less, MgO 5% or more than 20%, CaO 15% or less, 8% SrO or less, 15% ZnO less, TiO 2 7% or less, ZrO 2 5% or less, Li 2 O 1% or more than 10%, Na 2 O 2% or less, Y 2 O 3 10% Hereafter, La 2 O 3 is 10% or less, and the total content of Al 2 O 3 and MgO is Al 2 O 3 +
MgO is less than 28%, and Al 2 O 3 , MgO and C
Total of aO content Al 2 O 3 + MgO + CaO is 40%
It is preferably less than.
【００１６】また、下記酸化物基準のモル％表示で実質
的に、 ＳｉＯ2 ３８％以上５７％以下、 Ａｌ2Ｏ3 １％以上９．９％以下、 ＭｇＯ ５％以上２０％未満、 ＣａＯ ２０％以下、 ＳｒＯ １０％以下、 ＺｎＯ ３％以上２０％以下、 ＴｉＯ2 ５％以下、 ＺｒＯ2 ３％以下、 Ｌｉ2Ｏ １２％以下、 Ｎａ2Ｏ ２％以下、 Ｙ2Ｏ3 ３％未満、 Ｌａ2Ｏ3 ３％未満、 からなり、Ａｌ2Ｏ3とＭｇＯの含有量の合計Ａｌ2Ｏ3＋
ＭｇＯが２８％未満、かつ、Ａｌ2Ｏ3、ＭｇＯおよびＣ
ａＯの含有量の合計Ａｌ2Ｏ3＋ＭｇＯ＋ＣａＯが４０％
未満であることが好ましい。Further, in terms of mol% based on the following oxides, SiO 2 is 38% or more and 57% or less, Al 2 O 3 is 1% or more and 9.9% or less, MgO is 5% or more and less than 20%, CaO 20 % or less, 10% SrO or less, ZnO 3% or more and 20% or less, TiO 2 5% or less, ZrO 2 3% or less, Li 2 O 12% or less, Na 2 O 2% or less, Y 2 O 3 3% less, la 2 O 3 less than 3%, consists, Al 2 O 3 and the total content of MgO Al 2 O 3 +
MgO is less than 28%, and Al 2 O 3 , MgO and C
Total of aO content Al 2 O 3 + MgO + CaO is 40%
It is preferably less than.
【００１７】また、下記酸化物基準のモル％表示で実質
的に、 ＳｉＯ2 ３０％以上６０％以下、 Ａｌ2Ｏ3 １％以上９．９％以下、 ＭｇＯ １％以上２０％未満、 ＣａＯ ２５％以下、 ＳｒＯ １５％以下、 ＺｎＯ ２０％以下、 ＴｉＯ2 ５％以下、 ＺｒＯ2 ３％以下、 Ｌｉ2Ｏ １２％以下、 Ｎａ2Ｏ ２％以下、 Ｙ2Ｏ3 ２５％以下、 Ｌａ2Ｏ3 ２５％以下、 からなり、Ａｌ2Ｏ3とＭｇＯの含有量の合計Ａｌ2Ｏ3＋
ＭｇＯが２８％未満、かつ、Ａｌ2Ｏ3、ＭｇＯおよびＣ
ａＯの含有量の合計Ａｌ2Ｏ3＋ＭｇＯ＋ＣａＯが４０％
未満であることも好ましい。In addition, the following oxide-based molar percentages substantially indicate that SiO 2 is 30% or more and 60% or less, Al 2 O 3 is 1% or more and 9.9% or less, MgO is 1% or more and less than 20%, and CaO 25 is used. % or less, SrO 15% or less, 20% ZnO less, TiO 2 5% or less, ZrO 2 3% or less, Li 2 O 12% or less, Na 2 O 2% or less, Y 2 O 3 25% or less, La 2 O 3 25% or less, and the total content of Al 2 O 3 and MgO is Al 2 O 3 +
MgO is less than 28%, and Al 2 O 3 , MgO and C
Total of aO content Al 2 O 3 + MgO + CaO is 40%
It is also preferred that it is less than.
【００１８】本発明のガラスの組成について、モル％を
単に％と表記して以下に述べる。ＳｉＯ2は、ガラスを
安定化させるネットワークフォーマであり、また液相温
度を下げる成分であり必須である。６０％超ではヤング
率が小さくなりすぎる。好ましくは５７％以下、より好
ましくは５５％以下である。３０％未満ではガラスの安
定性が低下する。好ましくは３３％以上、より好ましく
は３５％以上、特に好ましくは３８％以上である。The composition of the glass of the present invention is described below by simply expressing mol% as%. SiO 2 is a network former for stabilizing glass, is a component for lowering the liquidus temperature, and is essential. If it exceeds 60%, the Young's modulus becomes too small. It is preferably at most 57%, more preferably at most 55%. If it is less than 30%, the stability of the glass decreases. It is preferably at least 33%, more preferably at least 35%, particularly preferably at least 38%.
【００１９】Ａｌ2Ｏ3はガラスを安定化させ、またヤン
グ率を大きくする成分であり必須である。２０％以上で
は液相温度が高くなりすぎる。好ましくは１５％以下、
より好ましくは１０％以下、特に好ましくは９．９％以
下、最も好ましくは５％未満である。１％未満ではヤン
グ率が小さくなりすぎる。好ましくは３％以上である。Al 2 O 3 is a component that stabilizes the glass and increases the Young's modulus, and is essential. If it is 20% or more, the liquidus temperature becomes too high. Preferably 15% or less,
It is more preferably at most 10%, particularly preferably at most 9.9%, most preferably less than 5%. If it is less than 1%, the Young's modulus becomes too small. It is preferably at least 3%.
【００２０】ＭｇＯはヤング率を大きくする成分であり
必須である。２０％以上では液相温度が高くなりすぎ
る。好ましくは１５％以下、より好ましくは１２％以
下、特に好ましくは１０％以下、最も好ましくは９．９
％以下である。１％未満ではヤング率が小さくなりすぎ
る。好ましくは５％以上である。なお、Ａｌ2Ｏ3含有量
が５％以上の場合、液相温度を低下させるためにＭｇＯ
含有量を１５％以下とすることが好ましい。MgO is a component that increases the Young's modulus and is essential. If it is 20% or more, the liquidus temperature becomes too high. Preferably not more than 15%, more preferably not more than 12%, particularly preferably not more than 10%, most preferably 9.9.
% Or less. If it is less than 1%, the Young's modulus becomes too small. It is preferably at least 5%. When the Al 2 O 3 content is 5% or more, MgO is used to lower the liquidus temperature.
The content is preferably 15% or less.
【００２１】Ａｌ2Ｏ3とＭｇＯの合量が２８％以上で
は、液相温度が高くなりすぎる。好ましくは２５％以
下、より好ましくは２３％以下、特に好ましくは２０％
以下である。When the total amount of Al 2 O 3 and MgO is 28% or more, the liquidus temperature becomes too high. Preferably 25% or less, more preferably 23% or less, particularly preferably 20%
It is as follows.
【００２２】ＣａＯは必須ではないが、溶融ガラスの粘
度を低下させ溶解を促進し、また液相温度を低下させる
ために２５％未満の範囲で含有してもよい。２５％超で
はヤング率が小さくなりすぎるおそれがある。より好ま
しくは２０％以下、さらに好ましくは１５％以下、特に
好ましくは１２％以下である。ＣａＯを含有する場合は
２％以上含有することがより好ましく、４％以上含有す
ることがさらに好ましい。Although CaO is not essential, it may be contained in a range of less than 25% in order to lower the viscosity of the molten glass to promote melting and to lower the liquidus temperature. If it exceeds 25%, the Young's modulus may be too small. It is more preferably at most 20%, further preferably at most 15%, particularly preferably at most 12%. When CaO is contained, it is more preferably contained at 2% or more, further preferably at least 4%.
【００２３】Ａｌ2Ｏ3、ＭｇＯおよびＣａＯの合量が４
０％以上では、液相温度が高くなりすぎる。好ましくは
３６％以下、より好ましくは３３％以下、特に好ましく
は３０％以下である。When the total amount of Al 2 O 3 , MgO and CaO is 4
If it is 0% or more, the liquidus temperature becomes too high. It is preferably at most 36%, more preferably at most 33%, particularly preferably at most 30%.
【００２４】ＳｒＯは必須ではないが、溶融ガラスの粘
度を低下させ溶解を促進するために、また液相温度を低
下させるために１５％まで含有してもよい。１５％超で
はヤング率が小さくなりすぎるおそれがある。より好ま
しくは１２％以下、さらに好ましくは１０％以下、特に
好ましくは８％以下である。SrO is not essential, but may be contained up to 15% in order to reduce the viscosity of the molten glass to promote melting and to lower the liquidus temperature. If it exceeds 15%, the Young's modulus may be too small. It is more preferably at most 12%, further preferably at most 10%, particularly preferably at most 8%.
【００２５】ＺｎＯは必須ではないが、液相温度を低下
させ、またヤング率を大きくするために２０％まで含有
してもよい。２０％超では液相温度が高くなりすぎるお
それがある。より好ましくは１７％以下、特に好ましく
は１５％以下である。ＺｎＯを含有する場合は１％以上
含有することが好ましい。より好ましくは３％以上、特
に好ましくは５％以上、最も好ましくは８％以上であ
る。ZnO is not essential, but may be contained up to 20% in order to lower the liquidus temperature and increase the Young's modulus. If it exceeds 20%, the liquidus temperature may be too high. It is more preferably at most 17%, particularly preferably at most 15%. When ZnO is contained, it is preferably contained at 1% or more. It is more preferably at least 3%, particularly preferably at least 5%, most preferably at least 8%.
【００２６】ＴｉＯ2は必須ではないが、ヤング率を大
きくし、また化学的耐久性を高くするために１０％まで
含有してもよい。１０％超では、分相、結晶化等により
ガラスの安定性が低下するおそれがある。より好ましく
は７％以下、さらに好ましくは５％以下、特に好ましく
は３％以下である。ガラスの安定性をより高めたい場合
はＴｉＯ2を実質的に含有しないことが好ましい。ま
た、ＴｉＯ2を含有する場合は１％以上含有することが
好ましい。TiO 2 is not essential, but may be contained up to 10% in order to increase Young's modulus and increase chemical durability. If it exceeds 10%, the stability of the glass may decrease due to phase separation, crystallization and the like. It is more preferably at most 7%, further preferably at most 5%, particularly preferably at most 3%. When it is desired to further enhance the stability of the glass, it is preferable that TiO 2 is not substantially contained. Further, when TiO 2 is contained, it is preferred to contain TiO 2 at 1% or more.
【００２７】ＺｒＯ2は必須ではないが、ヤング率を大
きくし、また化学的耐久性を高くするために１０％まで
含有してもよい。１０％超では溶融ガラスの粘度が大き
くなりすぎ溶解が困難になるおそれがある。より好まし
くは８％以下、さらに好ましくは５％以下、特に好まし
くは３％以下、最も好ましくは２％以下である。ＺｒＯ
2を含有する場合は１％以上含有することがより好まし
い。ZrO 2 is not essential, but may be contained up to 10% in order to increase Young's modulus and increase chemical durability. If it exceeds 10%, the viscosity of the molten glass may be too large to make melting difficult. It is more preferably at most 8%, further preferably at most 5%, particularly preferably at most 3%, most preferably at most 2%. ZrO
When 2 is contained, it is more preferred to contain 1% or more.
【００２８】Ｌｉ2Ｏは必須ではないが、溶融ガラスの
粘度を低下させ溶解を促進するために、またヤング率を
大きくするために１５％まで含有してもよい。１５％超
では液相温度が高くなりすぎ、また耐候性が低下するお
それがある。好ましくは１２％以下、より好ましくは１
０％以下、さらに好ましくは７％以下、特に好ましくは
３％以下、最も好ましくは２％未満である。Ｌｉ2Ｏを
含有する場合は１％以上含有することがより好ましい。Li 2 O is not essential, but may be contained up to 15% in order to reduce the viscosity of the molten glass to promote melting and to increase the Young's modulus. If it exceeds 15%, the liquidus temperature becomes too high, and the weather resistance may be reduced. Preferably 12% or less, more preferably 1%
0% or less, more preferably 7% or less, particularly preferably 3% or less, most preferably less than 2%. When Li 2 O is contained, it is more preferably contained at 1% or more.
【００２９】Ｎａ2Ｏは必須ではないが、溶融ガラスの
粘度を低下させ溶解を促進するために２％まで含有して
もよい。２％超では耐候性が低下し、またヤング率が小
さくなりすぎるおそれがある。より好ましくは１％以下
である。耐候性をより高め、またはヤング率をより大き
くしたい場合は実質的に含有しないことが好ましい。Although Na 2 O is not essential, it may be contained up to 2% in order to reduce the viscosity of the molten glass and promote melting. If it exceeds 2%, the weather resistance may be reduced and the Young's modulus may be too small. More preferably, it is 1% or less. When it is desired to further increase the weather resistance or to increase the Young's modulus, it is preferable that the compound is not substantially contained.
【００３０】Ｌｉ2ＯとＮａ2Ｏの含有量の合計は２％未
満であることが好ましい。２％以上では耐候性が低下す
るおそれがある。より好ましくは１％以下である。耐候
性をより高めたい場合はＬｉ2ＯとＮａ2Ｏのいずれも実
質的に含有しないことが好ましい。The total content of Li 2 O and Na 2 O is preferably less than 2%. If it is 2% or more, the weather resistance may decrease. More preferably, it is 1% or less. When it is desired to further increase the weather resistance, it is preferable that neither Li 2 O nor Na 2 O is substantially contained.
【００３１】Ｙ2Ｏ3は必須ではないが、ヤング率を大き
くするために２５％まで含有してもよい。２５％超では
液相温度が高くなりすぎるおそれがある。より好ましく
は１５％以下、さらに好ましくは１０％以下、特に好ま
しくは６％未満、最も好ましくは３％未満である。液相
温度をより低くしたい場合はＹ2Ｏ3を実質的に含有しな
いことが好ましい。また、Ｙ2Ｏ3を含有する場合は１％
以上含有することがより好ましく、２％以上含有するこ
とが特に好ましい。Y 2 O 3 is not essential, but may be contained up to 25% in order to increase the Young's modulus. If it exceeds 25%, the liquidus temperature may be too high. It is more preferably at most 15%, further preferably at most 10%, particularly preferably at most 6%, most preferably at most 3%. When it is desired to lower the liquidus temperature, it is preferable that Y 2 O 3 is not substantially contained. When Y 2 O 3 is contained, 1%
More preferably, the content is more preferably 2% or more.
【００３２】Ｌａ2Ｏ3は必須ではないが、ヤング率を大
きくするために２５％まで含有してもよい。２５％超で
は液相温度が高くなりすぎ、また密度が大きくなりすぎ
るおそれがある。より好ましくは１５％以下、さらに好
ましくは１０％以下、特に好ましくは６％未満、最も好
ましくは３％未満である。液相温度をより低くしたい場
合はＬａ2Ｏ3を実質的に含有しないことが好ましい。ま
た、Ｌａ2Ｏ3を含有する場合は１％以上含有することが
より好ましく、２％以上含有することが特に好ましい。La 2 O 3 is not essential, but may be contained up to 25% in order to increase the Young's modulus. If it exceeds 25%, the liquidus temperature may be too high and the density may be too high. It is more preferably at most 15%, further preferably at most 10%, particularly preferably at most 6%, most preferably at most 3%. When it is desired to lower the liquidus temperature, it is preferable that La 2 O 3 is not substantially contained. When La 2 O 3 is contained, the content is more preferably 1% or more, particularly preferably 2% or more.
【００３３】この他に、ヤング率を大きくするために、
必須ではないが、Ｖ2Ｏ5、Ｃｒ2Ｏ3、ＭｎＯ、Ｆｅ
2Ｏ3、ＣｏＯ、ＮｉＯ、ＣｕＯ、Ｇａ2Ｏ3、ＧｅＯ2、
Ｎｂ2Ｏ5、ＭｏＯ3、ＣｅＯ2、Ｐｒ2Ｏ3、Ｎｄ2Ｏ3、Ｐ
ｍ2Ｏ3、Ｓｍ2Ｏ3、Ｅｕ2Ｏ3、Ｇｄ2Ｏ3、Ｔｂ2Ｏ3、Ｄ
ｙ2Ｏ3、Ｈｏ2Ｏ3、Ｅｒ2Ｏ3、Ｔｍ2Ｏ3、Ｙｂ2Ｏ3、Ｈ
ｆＯ2、Ｔａ2Ｏ5およびＷＯ3からなる群から選ばれる１
種以上を含有してもよい。In addition, in order to increase the Young's modulus,
Although not essential, V 2 O 5 , Cr 2 O 3 , MnO, Fe
2 O 3 , CoO, NiO, CuO, Ga 2 O 3 , GeO 2 ,
Nb 2 O 5 , MoO 3 , CeO 2 , Pr 2 O 3 , Nd 2 O 3 , P
m 2 O 3 , Sm 2 O 3 , Eu 2 O 3 , Gd 2 O 3 , Tb 2 O 3 , D
y 2 O 3, Ho 2 O 3, Er 2 O 3, Tm 2 O 3, Yb 2 O 3, H
1 selected from the group consisting of fO 2 , Ta 2 O 5 and WO 3
It may contain more than one species.
【００３４】Ｖ2Ｏ5、Ｃｒ2Ｏ3、ＭｎＯ、Ｆｅ2Ｏ3、Ｃ
ｏＯ、ＮｉＯ、ＣｕＯ、Ｇａ2Ｏ3、ＧｅＯ2、Ｙ2Ｏ3、
Ｎｂ2Ｏ5、ＭｏＯ3、Ｌａ2Ｏ3、ＣｅＯ2、Ｐｒ2Ｏ3、Ｎ
ｄ2Ｏ 3、Ｐｍ2Ｏ3、Ｓｍ2Ｏ3、Ｅｕ2Ｏ3、Ｇｄ2Ｏ3、Ｔ
ｂ2Ｏ3、Ｄｙ2Ｏ3、Ｈｏ2Ｏ3、Ｅｒ2Ｏ3、Ｔｍ2Ｏ3、Ｙ
ｂ2Ｏ3、ＨｆＯ2、Ｔａ2Ｏ5およびＷＯ3の含有量の合計
ＲxＯyは２５％以下であることが好ましい。２５％超で
は液相温度が高くなりすぎるおそれ、または、密度が大
きくなりすぎ比弾性率が低下するおそれがある。より好
ましくは２０％以下、さらに好ましくは１５％以下、特
に好ましくは１０％以下、最も好ましくは３％以下であ
る。VTwoOFive, CrTwoOThree, MnO, FeTwoOThree, C
oO, NiO, CuO, GaTwoOThree, GeOTwo, YTwoOThree,
NbTwoOFive, MoOThree, LaTwoOThree, CeOTwo, PrTwoOThree, N
dTwoO Three, PmTwoOThree, SmTwoOThree, EuTwoOThree, GdTwoOThree, T
bTwoOThree, DyTwoOThree, HoTwoOThree, ErTwoOThree, TmTwoOThree, Y
bTwoOThree, HfOTwo, TaTwoOFiveAnd WOThreeTotal content of
RxOyIs preferably 25% or less. More than 25%
May cause the liquidus temperature to become too high, or
There is a possibility that the specific elastic modulus may be too low. Better
Preferably 20% or less, more preferably 15% or less,
Preferably 10% or less, most preferably 3% or less.
You.
【００３５】Ｖ2Ｏ5、Ｃｒ2Ｏ3、ＭｎＯ、Ｆｅ2Ｏ3、Ｃ
ｏＯ、ＮｉＯ、ＣｕＯ、Ｇａ2Ｏ3、ＧｅＯ2、Ｙ2Ｏ3、
Ｎｂ2Ｏ5、ＭｏＯ3、Ｌａ2Ｏ3、ＣｅＯ2、Ｐｒ2Ｏ3、Ｎ
ｄ2Ｏ 3、Ｐｍ2Ｏ3、Ｓｍ2Ｏ3、Ｅｕ2Ｏ3、Ｇｄ2Ｏ3、Ｔ
ｂ2Ｏ3、Ｄｙ2Ｏ3、Ｈｏ2Ｏ3、Ｅｒ2Ｏ3、Ｔｍ2Ｏ3、Ｙ
ｂ2Ｏ3、ＨｆＯ2、Ｔａ2Ｏ5およびＷＯ3からなる群から
選ばれる１種以上を含有する場合、ＲxＯyは０．１％以
上であることがより好ましく、さらに好ましくは１％以
上、特に好ましくは２％以上である。VTwoOFive, CrTwoOThree, MnO, FeTwoOThree, C
oO, NiO, CuO, GaTwoOThree, GeOTwo, YTwoOThree,
NbTwoOFive, MoOThree, LaTwoOThree, CeOTwo, PrTwoOThree, N
dTwoO Three, PmTwoOThree, SmTwoOThree, EuTwoOThree, GdTwoOThree, T
bTwoOThree, DyTwoOThree, HoTwoOThree, ErTwoOThree, TmTwoOThree, Y
bTwoOThree, HfOTwo, TaTwoOFiveAnd WOThreeFrom the group consisting of
When it contains one or more selected,xOyIs 0.1% or less
Above, more preferably 1% or less.
Above, particularly preferably 2% or more.
【００３６】ＭｇＯおよびＬｉ2Ｏの含有量の合計とＲx
Ｏyの和は、ガラスを安定化させ、また化学的耐久性を
高くするために２５％以下とすることが好ましい。The total content of MgO and Li 2 O and R x
The sum of O y is preferably 25% or less in order to stabilize the glass and increase the chemical durability.
【００３７】Ｌｉ2Ｏ、ＭｇＯ、Ｙ2Ｏ3、Ｌａ2Ｏ3、Ｃ
ｅＯ2、Ｐｒ2Ｏ3、Ｎｄ2Ｏ3、Ｐｍ2Ｏ3、Ｓｍ2Ｏ3、Ｅ
ｕ2Ｏ3、Ｇｄ2Ｏ3、Ｔｂ2Ｏ3、Ｄｙ2Ｏ3、Ｈｏ2Ｏ3、Ｅ
ｒ2Ｏ 3、Ｔｍ2Ｏ3およびＹｂ2Ｏ3の含有量の合計は２５
％以下であることが好ましい。LiTwoO, MgO, YTwoOThree, LaTwoOThree, C
eOTwo, PrTwoOThree, NdTwoOThree, PmTwoOThree, SmTwoOThree, E
uTwoOThree, GdTwoOThree, TbTwoOThree, DyTwoOThree, HoTwoOThree, E
rTwoO Three, TmTwoOThreeAnd YbTwoOThreeTotal content of
% Is preferable.
【００３８】本発明のガラスは実質的に上記成分からな
るが、他に、ＳＯ3、Ａｓ2Ｏ3、Ｓｂ2Ｏ3、等の清澄剤
を、それらの合量が２％までの範囲で適宜含有してもよ
い。また、ガラスの溶解を促進するためにＢａＯ、Ｋ2
Ｏ、等を含有してもよいが、過度の添加はヤング率を低
下させ、また耐候性を低下させるおそれがあるので、そ
れぞれ２％以下、それらの合量が３％以下、とすること
が好ましい。なお、ヤング率をより大きくしたい場合ま
たは耐候性をより高くしたい場合には、ＢａＯ、Ｋ2Ｏ
のいずれも実質的に含有しないことが好ましい。さら
に、ガラス溶解促進およびガラスの安定化をはかるため
に、Ｂ2Ｏ3、Ｐ2Ｏ5、等を添加してもよい。以上で述べ
た成分、すなわち本発明のガラスを実質的に構成する成
分以外の成分の含有量は合量で５％以下である。The glass of the present invention is substantially composed of the above-mentioned components. In addition, a fining agent such as SO 3 , As 2 O 3 , Sb 2 O 3 or the like may be used in an amount up to 2%. You may contain suitably. Further, BaO, K 2
O, etc., may be contained, but excessive addition may lower the Young's modulus and lower the weather resistance. preferable. In order to further increase the Young's modulus or to increase the weather resistance, BaO, K 2 O
Is preferably not substantially contained. Further, B 2 O 3 , P 2 O 5 , etc. may be added in order to promote glass melting and stabilize the glass. The content of the components described above, that is, components other than the components substantially constituting the glass of the present invention, is 5% or less in total.
【００３９】本発明の情報記録媒体基板用ガラスを製造
する方法は特に限定されず、各種製造方法を採用でき
る。たとえば、目標組成となるように通常使用される原
料を調合し、これを溶解炉中で加熱溶融する。バブリン
グや清澄剤の添加や撹拌などによってガラスの均質化を
行い、周知のプレス法、ダウンドロー法、フロート法な
どの方法により所定の板厚に成形し、徐冷後、研削、研
磨などの加工を行い、所定のサイズ、形状の基板とす
る。The method for producing the glass for an information recording medium substrate of the present invention is not particularly limited, and various production methods can be employed. For example, a commonly used raw material is prepared so as to have a target composition, and this is heated and melted in a melting furnace. Homogenize the glass by bubbling, adding a fining agent, stirring, etc., forming into a predetermined plate thickness by a well-known pressing method, down-draw method, float method, etc., slowly cooling, grinding, polishing, etc. Is performed to obtain a substrate having a predetermined size and shape.
【００４０】本発明の情報記録媒体用ガラス基板（以下
単に本発明のガラス基板という。）は本発明のガラスか
らなり、所定の寸法・形状に切断されたガラス板であ
る。本発明のガラス基板は、１２０℃、０．２ＭＰａの
水蒸気雰囲気に２０時間保持したときにその表面に存在
する、大きさが１０μｍ以上の付着物の数ＮLが１個／
ｃｍ2以下であり、大きさが１μｍ以上１０μｍ未満の
付着物の数ＮSが１０ 5個／ｃｍ2以下であることが好ま
しい。The glass substrate for an information recording medium of the present invention (hereinafter referred to as a glass substrate)
It is simply called the glass substrate of the present invention. ) Is the glass of the present invention
A glass plate cut into a specified size and shape.
You. The glass substrate of the present invention has a temperature of 120 ° C. and 0.2 MPa.
Exists on the surface when kept in a steam atmosphere for 20 hours
The number N of deposits having a size of 10 μm or moreL1 /
cmTwoLess than or equal to 1 μm and less than 10 μm
Number of deposits NSIs 10 FivePieces / cmTwoPreferably
New
【００４１】ＮLが１個／ｃｍ2超またはＮSが１０5個／
ｃｍ2超では、ガラス基板在庫時にその表面に付着物
（白ヤケ）が発生し、ガラス基板上に形成される下地
膜、磁性膜、保護膜等がはがれやすくなるおそれがあ
る。この付着物は、空気中の水分や炭酸ガスがガラス基
板と反応して生成したものと考えられ、拭いても除去で
きないものである。ＮLは、より好ましくは０．５個／
ｃｍ2以下、特に好ましくは０．２個／ｃｍ2以下であ
る。また、ＮSは、より好ましくは０．８×１０5個／ｃ
ｍ2以下、特に好ましくは０．６×１０5個／ｃｍ2以下
である。N L exceeds 1 piece / cm 2 or N S exceeds 10 5 pieces / cm 2
If it exceeds cm 2 , deposits (white burns) are generated on the surface of the glass substrate when it is stocked, and the base film, magnetic film, protective film, etc. formed on the glass substrate may be easily peeled off. This deposit is considered to have been generated by the reaction of moisture and carbon dioxide in the air with the glass substrate, and cannot be removed by wiping. N L is more preferably 0.5 /
cm 2 or less, particularly preferably 0.2 / cm 2 or less. NS is more preferably 0.8 × 10 5 pieces / c.
m 2 or less, particularly preferably 0.6 × 10 5 / cm 2 or less.
【００４２】[0042]
【実施例】表のＳｉＯ2〜Ｎｂ2Ｏ5の欄にモル％表示で
示した組成となるように原料を調合して白金るつぼに入
れ、１４５０〜１６５０℃に加熱し３〜５時間溶融し
た。この際白金スターラにより２時間撹拌し溶融ガラス
を均質化した。次いで溶融ガラスを流し出して板状に成
形後、徐冷を行った。EXAMPLES Raw materials were prepared so as to have the composition shown in mol% in the column of SiO 2 to Nb 2 O 5 in the table, put into a platinum crucible, heated to 1450 to 1650 ° C. and melted for 3 to 5 hours. . At this time, the mixture was stirred with a platinum stirrer for 2 hours to homogenize the molten glass. Next, the molten glass was poured out, formed into a plate shape, and then gradually cooled.
【００４３】得られたガラスについて、ヤング率（単
位：ＧＰａ）、液相温度（単位：℃）および密度（単
位：ｇ／ｃｍ3）を測定した。ヤング率を密度で除した
比弾性率（単位：ＧＰａ／ｇ／ｃｍ3）の値とともに表
に示す。なお、例５５〜１６７についてはヤング率のみ
測定した。The obtained glass was measured for Young's modulus (unit: GPa), liquidus temperature (unit: ° C.) and density (unit: g / cm 3 ). The results are shown in the table together with specific elastic modulus (unit: GPa / g / cm 3 ) obtained by dividing Young's modulus by density. In Examples 55 to 167, only the Young's modulus was measured.
【００４４】ヤング率、液相温度および密度の測定方法
は以下のとおりである。 ヤング率：４ｃｍ×４ｃｍのガラス板の両面が平行にな
るように研磨して、厚さを１０〜２０ｍｍとした試料に
ついて、超音波パルス法により測定した。 液相温度：ガラスを乳鉢で２ｍｍ程度のガラス粒に粉砕
し、このガラス粒を白金ボートの上に並べて置く。この
白金ボートを温度傾斜炉に入れて２時間熱処理し、結晶
が析出しているガラス粒が位置していた部分の温度の最
高値を液相温度とした。 密度：約２０ｇのガラスについて、アルキメデス法によ
り測定した。The methods for measuring the Young's modulus, liquidus temperature and density are as follows. Young's modulus: A glass plate of 4 cm × 4 cm was polished so that both surfaces were parallel to each other, and the thickness of the sample was set to 10 to 20 mm, and the sample was measured by an ultrasonic pulse method. Liquidus temperature: The glass is crushed into glass particles of about 2 mm in a mortar, and the glass particles are placed side by side on a platinum boat. This platinum boat was placed in a temperature gradient furnace and heat-treated for 2 hours, and the highest value of the temperature of the portion where the glass particles on which the crystals had precipitated was located was defined as the liquidus temperature. Density: About 20 g of glass was measured by the Archimedes method.
【００４５】また、厚さが１〜２ｍｍであり、大きさが
４ｃｍ×４ｃｍのガラス板の両面を鏡面研磨し、これを
炭酸カルシウムおよび中性洗剤により洗浄して耐候性試
験サンプルを用意した。このサンプルを超加速寿命試験
器（不飽和型プレッシャークッカーＴＰＣ−４１０、タ
バイエスペック（株））に入れて１２０℃、０．２ＭＰ
ａの水蒸気雰囲気に２０時間静置した。取り出したサン
プルの表面２００μｍ×２００μｍの範囲を微分干渉顕
微鏡で観察し、大きさが１０μｍ以上の付着物の個数と
大きさが１μｍ以上１０μｍ未満の付着物の個数をカウ
ントした。これら個数からＮL（単位：個／ｃｍ2）およ
びＮS（単位：１０5個／ｃｍ2）を算出した。結果を表
に示す。例１〜１７２は実施例、例１７３〜１７６は特
開平１１−１１６２６７等に開示されているガラスであ
り比較例である。Further, both sides of a glass plate having a thickness of 1 to 2 mm and a size of 4 cm × 4 cm were mirror-polished and washed with calcium carbonate and a neutral detergent to prepare a weather resistance test sample. This sample was placed in a super-accelerated life tester (unsaturated pressure cooker TPC-410, Tabai Espec Corp.) at 120 ° C. and 0.2 MPa.
The sample was allowed to stand in the water vapor atmosphere of (a) for 20 hours. The area of 200 μm × 200 μm of the surface of the sample taken out was observed with a differential interference microscope, and the number of deposits having a size of 10 μm or more and the number of deposits having a size of 1 μm to less than 10 μm were counted. From these numbers, N L (unit: pieces / cm 2 ) and N S (unit: 10 5 pieces / cm 2 ) were calculated. The results are shown in the table. Examples 1 to 172 are Examples and Examples 173 to 176 are glasses disclosed in Japanese Patent Application Laid-Open No. H11-116267 and comparative examples.
【００４６】[0046]
【表１】 [Table 1]
【００４７】[0047]
【表２】 [Table 2]
【００４８】[0048]
【表３】 [Table 3]
【００４９】[0049]
【表４】 [Table 4]
【００５０】[0050]
【表５】 [Table 5]
【００５１】[0051]
【表６】 [Table 6]
【００５２】[0052]
【表７】 [Table 7]
【００５３】[0053]
【表８】 [Table 8]
【００５４】[0054]
【表９】 [Table 9]
【００５５】[0055]
【表１０】 [Table 10]
【００５６】[0056]
【表１１】 [Table 11]
【００５７】[0057]
【表１２】 [Table 12]
【００５８】[0058]
【表１３】 [Table 13]
【００５９】[0059]
【表１４】 [Table 14]
【００６０】[0060]
【表１５】 [Table 15]
【００６１】[0061]
【表１６】 [Table 16]
【００６２】[0062]
【表１７】 [Table 17]
【００６３】[0063]
【表１８】 [Table 18]
【００６４】[0064]
【発明の効果】本発明のガラスを用いることにより、基
板を薄くしてもたわみや反りの問題が生じにくく、研磨
がしやすく、また大量生産が容易な情報記録媒体基板用
ガラスを提供できる。また、本発明のガラス基板は耐候
性に優れ、その上に形成された下地膜、磁性膜、保護膜
等がはがれにくい。By using the glass of the present invention, it is possible to provide a glass for an information recording medium substrate which is less likely to be bent or warped even when the substrate is thinned, is easily polished, and is easily mass-produced. Further, the glass substrate of the present invention has excellent weather resistance, and a base film, a magnetic film, a protective film and the like formed thereon are not easily peeled off.
Claims (6)
ＭｇＯが２８％未満、かつ、Ａｌ2Ｏ3、ＭｇＯおよびＣ
ａＯの含有量の合計Ａｌ2Ｏ3＋ＭｇＯ＋ＣａＯが４０％
未満である情報記録媒体基板用ガラス。1. A substantially in mole% based on the following oxides, SiO 2 30% to 60% or less, Al 2 O 3 less than 1% to 20%, 1% or more than 20% MgO, CaO 25% or less SrO 15% or less, ZnO 20% or less, TiO 2 10% or less, ZrO 2 10% or less, Li 2 O 15% or less, Na 2 O 2% or less, Y 2 O 3 25% or less, La 2 O 3 25 % Or less, and the total content of Al 2 O 3 and MgO is Al 2 O 3 +
MgO is less than 28%, and Al 2 O 3 , MgO and C
Total of aO content Al 2 O 3 + MgO + CaO is 40%
Less than the glass for an information recording medium substrate.
ｏＯ、ＮｉＯ、ＣｕＯ、Ｇａ2Ｏ3、ＧｅＯ2、Ｙ2Ｏ3、
Ｎｂ2Ｏ5、ＭｏＯ3、Ｌａ2Ｏ3、ＣｅＯ2、Ｐｒ2Ｏ3、Ｎ
ｄ2Ｏ 3、Ｐｍ2Ｏ3、Ｓｍ2Ｏ3、Ｅｕ2Ｏ3、Ｇｄ2Ｏ3、Ｔ
ｂ2Ｏ3、Ｄｙ2Ｏ3、Ｈｏ2Ｏ3、Ｅｒ2Ｏ3、Ｔｍ2Ｏ3、Ｙ
ｂ2Ｏ3、ＨｆＯ2、Ｔａ2Ｏ5およびＷＯ3からなる群から
選ばれる１種以上を含有し、これらの含有量の合計が
０．１モル％以上２５モル％以下である請求項１に記載
の情報記録媒体基板用ガラス。(2) VTwoOFive, CrTwoOThree, MnO, FeTwoOThree, C
oO, NiO, CuO, GaTwoOThree, GeOTwo, YTwoOThree,
NbTwoOFive, MoOThree, LaTwoOThree, CeOTwo, PrTwoOThree, N
dTwoO Three, PmTwoOThree, SmTwoOThree, EuTwoOThree, GdTwoOThree, T
bTwoOThree, DyTwoOThree, HoTwoOThree, ErTwoOThree, TmTwoOThree, Y
bTwoOThree, HfOTwo, TaTwoOFiveAnd WOThreeFrom the group consisting of
Contains one or more selected, and the total of these contents is
2. The composition according to claim 1, wherein the content is from 0.1 mol% to 25 mol%.
For information recording medium substrates.
または２に記載の情報記録媒体基板用ガラス。3. The liquid phase temperature is 1300 ° C. or lower.
Or the glass for an information recording medium substrate according to 2.
１、２または３に記載の情報記録媒体基板用ガラス。4. The glass for an information recording medium substrate according to claim 1, wherein the Young's modulus is 100 GPa or more.
媒体基板用ガラスからなる情報記録媒体用ガラス基板。5. A glass substrate for an information recording medium comprising the glass for an information recording medium substrate according to claim 1.
板であって、１２０℃、０．２ＭＰａの水蒸気雰囲気に
２０時間保持した該ガラス基板表面に存在する、大きさ
が１０μｍ以上の付着物の数が１個／ｃｍ2以下であ
り、大きさが１μｍ以上１０μｍ未満の付着物の数が１
０5個／ｃｍ2以下である情報記録媒体用ガラス基板。6. The glass substrate for an information recording medium according to claim 5, wherein the glass substrate has a size of 10 μm or more, which is present on the surface of the glass substrate kept at a temperature of 120 ° C. and a water vapor atmosphere of 0.2 MPa for 20 hours. The number of objects is 1 / cm 2 or less, and the number of adherents having a size of 1 μm or more and less than 10 μm is 1
0 5 / cm 2 or less is the information recording medium glass substrate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34361899A JP2001134925A (en) | 1999-08-25 | 1999-12-02 | Glass for information recording medium board and glass board for information recording medium |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23877899 | 1999-08-25 | ||
| JP11-238778 | 1999-08-25 | ||
| JP34361899A JP2001134925A (en) | 1999-08-25 | 1999-12-02 | Glass for information recording medium board and glass board for information recording medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2001134925A true JP2001134925A (en) | 2001-05-18 |
Family
ID=26533884
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP34361899A Pending JP2001134925A (en) | 1999-08-25 | 1999-12-02 | Glass for information recording medium board and glass board for information recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2001134925A (en) |
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